Shaking-grate.



G. H. THACHER, In.

SHAKING GRATE.

APPLICATION FILED MAY 25. IBII.

Patented May 30,

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GEORGE H. TEACHER, JR., OF ALBANY, NEW YORK, ASSIGNOR TO GEORGE H. THACI-IER, SR., OF ALBANY, NEW YORK.

SHAKING-GRATE.

Specification of Letters Patent.

Patented May 30, 1916.

To all whom t may concern.'

Be it known that I, GEORGE H. THAUHER, Jr., a citizen ofthe United States, residing at Albany, county of Albany, State of New York, have invented certain new andl useful Improvements in Shaking-Grates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in furnace-grates, the main object being to provide a durable grate-bar therefor, having the attributes of simplicity, low cost of manufacture and high efficiency.

Another feature of the invention con sists in locating those 0f the parts that are l particularly subject to strain well below the re surfaces of the grate.

Further features of the invention consist in providing for the easy replacement, when burned, of the fire surface throughout the length of the grate bar; in providinga grate which may be e'ectively shaken; and in so constructing the individual grate bars that free passage for air' therethrough is provided while at the same time great strength is secured.

The accompanying drawings illustrate one embodiment of the invention.

In the drawings: Figure l is a plan; Fig. 2 is a side elevation; Fig. 3, an end elevation, and Fig. i a section through the bar on line 4--4 of Fig. 1.

Referring to the drawings, the frame of the grate bar is preferably cast in one piece and consists of the two end pieces A, from which the supporting trunnions B, B project; the side bars C, C, the inner edges of which are rabbeted at D, D; the central supporting bar E lying below the side bars C, C, and connecting the end pieces A, A; and the struts F, F, supporting the side bars C, C, from the supporting bar E. The struts F, F, join the side bars C, C, at their under sides and do not approach the fire surface nor do they extend across the space between the side bars C, C, this space being open throughout the length of the bar.

The true grate surface consists of a series of grate sections G, which are slightly crowned and rest in the rabbets D on the side bars C, C, abutting one another throughout the entire length of the grate bar. The entire under surfaces of the sections Gr are open to the air, their only points of contact with the frame of the grate bar being in the rabbets D. Any of these sections may be replaced when burned out or when it is desired to change the character of the grate surface to suit the particular fuel used.

The sections G are each provided with a strap H cast into a boss it on the under surfaces of the section, which strap isprovided with a hole I which is arranged to register with a hole in the main supporting bar E and a split pin K secures each of the straps H to bar E each of the sections G -being secured to the frame in this manner.

Each of the sections G is a grid rconsisting of two longitudinal bars and a series of transverse bars intersecting with and pro-k jecting beyond the longitudinal bars and the free projecting ends of these transverse bars rest in the rabbets D.

Two arms L, L, depend from the main supporting bar E of the frame, to which arms the shaking levers are attached to rock the complete arm when it is suitably mounted upon its trunnions in a completed grate. One of these arms forms a vcontinuation of one pair of struts F.

The outeredges of the side bars C, C, and the end pieces A, A, are corrugated or serrated toprevent the clogging which occurs between two straight edges in close proximity when ash and clinkers are present.

What'I claim is:

1. In a grate bar, the combination with a frame shaped to form a cradle and comprising end pieces connected together at their lower portions by a main supporting bar and integral therewith and connected together at their upper corners by side bars, each of which has a rabbeted inner edge, said end pieces each carrying a supporting trunnion integral therewith and centrally positioned thereon, struts extending divergently upward from said main supporting bar to support said side bars intermediate their ends and form a truss construction unobstructed from end piece to end piece and affording free circulation of air, and a plurality of crowned grate sections abutting on one another and each having transverse bars with their ends seated inthe rabbeted inner edges of the side bars substantially flush` thereby.

2. In a grate bar for boiler furnaces, the combination with a frame consisting of end pieces carrying integral trunnions centrally positioned and connected together at their lower portions by a main supporting bar integral therewith, said pieces being connected together at their upper corners by a pair of top bars spaced apart, and struts independently connecting said side bars with said main supporting bar and integral therewith, and shaped to leave an unobstructed opening from end piece' to end piece between said side bars, of a series of grate sections comprising transverse bars each seated on the side bars but terminating short of the outer edges of said bars, said grate sections being crowned and abutting throughout to form a continuous curved grate surface from one end piece to the other, substantially as described.

3. In a grate frame comprising upper longitudinalbearing braces, end walls connecting said braces, alower connecting brace connecting said end walls, a leg extending from the lower brace, grate sections supported upon said upper braces, the outer ends of a therewith, and supported and protected pair of said grate sections abutting against the end walls of the grate frame, and the other ends of the pair of grate sections abutting against the end face of an accompanying grate section.

4f. In a grate frame comprising upper longitudinal bearing braces, end walls connectingsaid braces, a lower connecting brace connecting said end walls, a leg extending from the lower brace, and a plurality of grate sections supported upon said upper braces, the outer ends of a pair of said grate sections abutting against the end walls of the grate frame, said sections forming a continuous grate surface from end wall to end wall, substantially as described.

5. In a grate bar, the combination with a frame in the form of 'a cradle integral throughout and consisting off end pieces provided with trunnions, said end pieces being connected together at their lower porf tions by a 'central supporting bar positioned lower than said trunnions and being connected together at their upper corners by two side bars having rabbeted inner edges and a pluralityof struts integral with the central supporting bar and extending divergently upward for connection with the side bars to leave an unobstructed space from end piece to end piece between the side bars, and a series of crowned grate sections each comprising transverse bars which seat on the rabbeted inner edges of the side bars and are supported solely thereby, and arms under said cradle and integral therewith for rocking said framey on'its trunnions.

6. In a grate bar for boiler furnaces, the combination of a supporting cradle of truss construction, having end plates each provided with a trunnion, said plates being connected together at their lower portions by a central supporting bar and being connected together at their upper corners by side bars serrated along their outer edges and rabbeted along their inner edges, said trunnions being located above the central line of said central supporting bar, struts integral with said central supporting bar and extending divergently upward for connection to the undersidesof said side bars, all of said parts being cast in a single piece and leaving an unobstructed opening from yend to end between the side bars, and a plurality of crowned grate sections abuting lagainst yone another, each of said sections comprising a plurality of longitudinal bars and a series of transverse bars, said transverse bars extending across. between the side bars of the cradle and seating on the rabbeted edges'of the side bars and substantially Hush with the tops thereof when saidk grate sections are in position in the cradle, and an arm integral with the central supporting bar of the cradle and forming an integral extension of ak pair of struts Yto serve as means for rocking wthe'grate bar on its trunnions when the bar ismounted as part ofa complete furnace grate.

In testimony whereof I aiiix my signature, in presence of two witnesses. f

, GEORGE H THACHER, JR.

lVitnesses:

ARTHUR R. ST. JOHN,

VVILIJIAM H. VDAVIS.`

Copies of this patent may be obtained.V for ve cents each,V by addressing the Commissioner of'latents, Washington, D. C. 

